[CodeGen] Use make_early_inc_range (NFC)

llvm/lib/CodeGen/BranchFolding.cpp

@@ -1752,10 +1752,8 @@ ReoptimizeBlock:
 
 bool BranchFolder::HoistCommonCode(MachineFunction &MF) {
   bool MadeChange = false;
-  for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ) {
-    MachineBasicBlock *MBB = &*I++;
-    MadeChange |= HoistCommonCodeInSuccs(MBB);
-  }
+  for (MachineBasicBlock &MBB : llvm::make_early_inc_range(MF))
+    MadeChange |= HoistCommonCodeInSuccs(&MBB);
 
   return MadeChange;
 }

llvm/lib/CodeGen/CodeGenPrepare.cpp

@@ -530,10 +530,9 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
   while (MadeChange) {
     MadeChange = false;
     DT.reset();
-    for (Function::iterator I = F.begin(); I != F.end(); ) {
-      BasicBlock *BB = &*I++;
+    for (BasicBlock &BB : llvm::make_early_inc_range(F)) {
       bool ModifiedDTOnIteration = false;
-      MadeChange |= optimizeBlock(*BB, ModifiedDTOnIteration);
+      MadeChange |= optimizeBlock(BB, ModifiedDTOnIteration);
 
       // Restart BB iteration if the dominator tree of the Function was changed
       if (ModifiedDTOnIteration)
@@ -8029,9 +8028,8 @@ bool CodeGenPrepare::placeDbgValues(Function &F) {
   DominatorTree DT(F);
 
   for (BasicBlock &BB : F) {
-    for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); BI != BE;) {
-      Instruction *Insn = &*BI++;
-      DbgValueInst *DVI = dyn_cast<DbgValueInst>(Insn);
+    for (Instruction &Insn : llvm::make_early_inc_range(BB)) {
+      DbgValueInst *DVI = dyn_cast<DbgValueInst>(&Insn);
       if (!DVI)
         continue;
 

llvm/lib/CodeGen/GlobalISel/Localizer.cpp

@@ -92,9 +92,8 @@ bool Localizer::localizeInterBlock(MachineFunction &MF,
     // Check if all the users of MI are local.
     // We are going to invalidation the list of use operands, so we
     // can't use range iterator.
-    for (auto MOIt = MRI->use_begin(Reg), MOItEnd = MRI->use_end();
-         MOIt != MOItEnd;) {
-      MachineOperand &MOUse = *MOIt++;
+    for (MachineOperand &MOUse :
+         llvm::make_early_inc_range(MRI->use_operands(Reg))) {
       // Check if the use is already local.
       MachineBasicBlock *InsertMBB;
       LLVM_DEBUG(MachineInstr &MIUse = *MOUse.getParent();

llvm/lib/CodeGen/StackProtector.cpp

@@ -440,9 +440,8 @@ bool StackProtector::InsertStackProtectors() {
        !TM->Options.EnableGlobalISel);
   AllocaInst *AI = nullptr;       // Place on stack that stores the stack guard.
 
-  for (Function::iterator I = F->begin(), E = F->end(); I != E;) {
-    BasicBlock *BB = &*I++;
-    ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator());
+  for (BasicBlock &BB : llvm::make_early_inc_range(*F)) {
+    ReturnInst *RI = dyn_cast<ReturnInst>(BB.getTerminator());
     if (!RI)
       continue;
 
@@ -530,23 +529,23 @@ bool StackProtector::InsertStackProtectors() {
 
       // Split the basic block before the return instruction.
       BasicBlock *NewBB =
-          BB->splitBasicBlock(CheckLoc->getIterator(), "SP_return");
+          BB.splitBasicBlock(CheckLoc->getIterator(), "SP_return");
 
       // Update the dominator tree if we need to.
-      if (DT && DT->isReachableFromEntry(BB)) {
-        DT->addNewBlock(NewBB, BB);
-        DT->addNewBlock(FailBB, BB);
+      if (DT && DT->isReachableFromEntry(&BB)) {
+        DT->addNewBlock(NewBB, &BB);
+        DT->addNewBlock(FailBB, &BB);
       }
 
       // Remove default branch instruction to the new BB.
-      BB->getTerminator()->eraseFromParent();
+      BB.getTerminator()->eraseFromParent();
 
       // Move the newly created basic block to the point right after the old
       // basic block so that it's in the "fall through" position.
-      NewBB->moveAfter(BB);
+      NewBB->moveAfter(&BB);
 
       // Generate the stack protector instructions in the old basic block.
-      IRBuilder<> B(BB);
+      IRBuilder<> B(&BB);
       Value *Guard = getStackGuard(TLI, M, B);
       LoadInst *LI2 = B.CreateLoad(B.getInt8PtrTy(), AI, true);
       Value *Cmp = B.CreateICmpEQ(Guard, LI2);